High-efficiency organic solar cells enabled by halogenation of polymers based on 2D conjugated benzobis(thiazole)

Abstract

<p>A novel polymer based on 2D conjugated benzobis(thiazole) exhibits a high power conversion efficiency of 14.8% in an organic solar cell with IT-4F as the acceptor, with short circuit density and open circuit voltage well-balanced therein.</p>

A New Alcohol‐Soluble Polymer PFN‐ID as Cathode Interlayer to Optimize Performance of Conventional Polymer Solar Cells by Increasing Electron Mobility

“…It is suggested that PFN-ID facilitates charge extraction and reduces charge aggregation at the interface, resulting in a stronger charge collection capacity, which is consistent with a higher J sc and FF. [42][43][44][45][46][47][48][49][50][51][52][53][54] To understand the surface polarity, the wettability of CILs on the photoactive layer (PTB7-Th:PC 71 BM) was determined by water contact angle (WCA) measurements. These images were obtained with a digital camera.…”

“…It is suggested that PFN‐ID facilitates charge extraction and reduces charge aggregation at the interface, resulting in a stronger charge collection capacity, which is consistent with a higher J sc and FF. [ 42–54 ]…”

Control of aggregated structure of photovoltaic polymers for high‐efficiency solar cells

“…[384][385][386] Especially, the halogenation on the side chain of BDT unit was demonstrated to enhance the crystallinity and aggregated order effectively. [387,388] For instance, PBDT-Cl and PBDT-F exhibited stronger crystallinity than nonhalogenated PBDT-H. [388] Interestingly, PBDT-Cl has a smaller π-π stacking distance and larger L c than that of PBDT-F and PBDT-H. Meanwhile, the PBDT-Cl:Y6 blend exhibited the most compact π-π stacking and strongest crystallinity that contributed to favorable order and domain purity.…”

“…The influence of side chain on the aggregated structure is widely investigated in different polymer:NFAs blend. [384][385][386][387][388] The length, substituted position and steric hindrance of side chain were demonstrated to have a distinct influence on the aggregation, crystallinity, and domain features of BHJs blend. [384][385][386] Especially, the halogenation on the side chain of BDT unit was demonstrated to enhance the crystallinity and aggregated order effectively.…”

Wide bandgap polymer donors for high efficiency non-fullerene acceptor based organic solar cells

“…204 Xu et al 157 synthesized PO3 (PBDS-TZ) using alkylsilyl BDT and TZ as the D and A unit, respectively, to lower the E HOMO and improve the backbone planarity and charge transport. 158 employed BDT and BBT both with alkylthiophene side chains as the D and A units, respectively, and introduced different halogen atoms (F and Cl) on the thiophene side chains of the BDT units to form polymers PO4 (PBB-H), PO5 (PBB-F), and PO6 (PBB-Cl). When blended with IT-4F, similarly high J SC values were obtained for these three polymers due to their high extinction coefficient and favourable face-on orientation.…”